kent williams wrote:
http://public.kitware.com/Bug/view.php?id=7084
I made the simplest possible library project, and then messed it up
based on our build system just enough to reproduce the error. ;-)
Now obviously, what is done in this project -- Calling Cmake from make
to batch-configure projects -- might be off-label usage for CMake.
But the little test project demonstrates something annoying and a bit
disturbing: Running cmake twice with the same command line parameters
works for an empty build directory, and fails for an already existing
build directory.
So, what is happening is that CMake things you have swapped compilers
and it deletes the cache. That is so try-compiles get re-run with a
new compiler. However, the effect is that it also deletes the -D stuff
from the command line. If your rule did not set the compiler it would
work better. I will see if I can come up with a fix for this. However,
I would recommend you run cmake as a shell script, and use CC and CXX
environment variables to set the compiler and not -D options. That
should be a viable workaround.
-Bill
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